Compatible Models: Compatible with MA Series 25 S1/W1/B1 Air Purifier, 3-in-1 True Hepa and Activated Carbon Filter. This replacement filter is true HEPA H13 Filter, perform just as well as the original filters and fit perfectly. Please Check the model of your air purifier before placing your order to avoid from purchaing incorrectly. True H13 HEPA Filter: Triple-layer filtration H13 True HEPA filter system can efficiently capture 99.97% of airborne particles as small as 0.3 microns, and can also capture larger airborne particles such as dust, hair, pet dander and cotton. 3-IN-1 TRUE HEPA: 3-in-1 True Hepa Filter can capture small dust, hairs etc. protect the motor. Which including Nylon Pre-Filter, True HEPA 13 Filter, and Activated Carbon Filter. Easy To Replace: Recommended to replace filters every 3-4 months depending on usage and environment. To keep your air purifier running properly. Providing you and your family with a comfortable environment. Package: Included 4 Pack, usually can used 1 year. Providing you and your family with a comfortable environment every day.

4 Pack MA Series 25 Replacement Filters Compatible with 25 B1/S1/W1 Air Purifier, 3-in-1 Filter with True Hepa, Pre-Filter and Activated Carbon Filter